Can you explain the research behind the Safety Measurement System (SMS) violation severity weightings?
First, applicable safety-based violations of the Federal Motor Carrier Safety Regulations and the Hazardous Materials Regulations were distributed into the appropriate Behavior Analysis and Safety Improvement Categories (BASICs). The next step in the process was putting similar violations in each BASIC into groups of similar violations within the BASIC. For example, the Vehicle BASIC has Tire and Brake groupings, among others. Within each BASIC the violation groups are assigned severity weights that reflect the violation groups association with crash occurrence and crash consequences. The stronger the relationship between a violation group and crash risk, the higher its assigned weight. The violation severity weights have been converted into a scale from 1 to 10, where 1 represents the lowest crash risk and 10 represents the highest crash risk relative to the other violations in the BASIC. Since the weights reflect the relative importance of each violation within each particular BASIC,
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